@Maarten: @Netmorin: Since 1.2.8, Insync tries to create a copy of the Google format file corresponding to the .gddoc, .gdsheet etc. files that were added locally. Previously, Insync would just ignore those files. What error message are you getting? Is it: “Can’t process - x: file not found”? If so, the corresponding Google format files to those .gddoc files must not exist in your Google Drive anymore (could have been unshared or permanently deleted), that’s why Insync can’t create a copy of those files.
@Netmorin: Could you send to us Insync logs at support@insynchq.com so that we could look at the cause of those duplicates? Here is how to locate the log files: How to find the log files
Thanks